High Pitch Noise Q

[richard_masa_4200]

I have finally taken out my back seats shelf and side panels to isolate an annoying squeak I have around the area of my fuel filler pipe, but that's another story.

Since I have the rear accoutrements removed I can hear a very high pitched sound coming from the rear. It sort of sounds electrical, is fairly constant, but wavers just slightly when I change from 1st to 2nd.

Any ideas? I'm suspecting maybe fuel pump(s) or F1 pump. While I have my back seat in my garage I'm thinking I should try and fix this as well.

 

[conaero]

Hum, tricky one.

I think your on the right track.

Might be worth having a look at the tracker if it's under there and also there is a little buzzer for the reverse sensors, would not be that shorting would it?

As for the F1 pump, that should not be on all the time, if it is, the relay is shot and the pump will burn out, a common fault.

Again, the fuel pumps that are submerged in the tank should not be on constant, they pulse and should be silent. There is from memory a tank breath/filter/carbon canister which has been known to make strange sounds.

All the best.

 

[Emtee]

Could be a whiney relay in the battery compartment?

 

[urbanmaser]

Could be my mother in law in the back seat

 

[Danny]

Perhaps a fuel pump which is on it's way out?

 

[richard_masa_4200]

I had a closer listen from the boot tonight. Definitely something in the tank, one can only assume the drivers side fuel pump. I'm sure the annoyance factor will fade with the realization of what it would take to get at the fuel pump.

 

[conaero]

Hum, that would be a job. There is a valve ontop of the tank that is something to do with vapour recovery. I have heard tails of this being a fault similar to your description.

To get to the tank you have to go in via the boot and remove the carpet liner. It's a tricky job as if you go in too heavy handed the carpet liner will rip. I found this out on my GS (now on its way to Aus by the way) and repaired it from behind with fibre glass.

 

[Zombie]

Is it picking up on your Audio system. If so then maybe an audio input cable has been re-routed too close to the pumps, or is picking up off the ignition system somehow. If you have a separate amp, turn down the amp gain so that your head unit has to be turned up higher for a given AMP sound output. This improves the Signal versus noise and you will probably lose the buzz because your CD music will be 100 times loader than the pick-up buzz.

If it's coming from something mechanical e.g. a rotating pump or buzzy relay, a good way of picking up the source of mechanical noise is to stick a screwdriver in your ear (NB the handle end) and then use the other end of it as a probe by holding firmly onto the suspected sources until you find the loudest matching sound.

Cheers, Zombie

 

[hodroyd]

There is definitely nobody stuck underneath the car then, remember that strange bump, like a speed bump but there wasn't one?? I had an ex-girlfriend once who whined a lot in the back of the car!!
Zombie's idea with the screwdriver works, but note the handle in the ear, not the other way round.

 

[richard_masa_4200]

There is definitely nobody stuck underneath the car then, remember that strange bump, like a speed bump but there wasn't one?? I had an ex-girlfriend once who whined a lot in the back of the car!!
Zombie's idea with the screwdriver works, but note the handle in the ear, not the other way round.

I have removed all traces of the ex-wife from the car. Anyway, she was more of a blah-blah-blah-blah-suck-the-life-out-of-me whine.

 

[Danny]

a good way of picking up the source of mechanical noise is to stick a screwdriver in your ear

Cheers, Zombie

Thanks for your advice. I immediately tried it but I can tell you it was bloody painful. On the other hand, I managed to find the culprit (and therefore you can see me smiling on the picture)

 

[Zombie]

Oh no!

Stick a screwdriver in your ear, handle side first is what i said -- very important detail there.

But hey the silver lining is that the whine is probably barely audible now!

 

[Fat Arnie]

Stethoscope with the end taken off is much better and you are not likely to injure yourself. Available on ebay for about £2.

 

[lozcb]

Thanks for your advice. I immediately tried it but I can tell you it was bloody painful. On the other hand, I managed to find the culprit (and therefore you can see me smiling on the picture)

Love it , hahaha ,


regards loz

 

[hodroyd]

Is there a doctor in the house - with a stethascope????

BRILLIANT I LOVE IT

 

[2b1ask1]

I have a screwdriver just like that in the wall of my garage and I use it to hang my shovels on.... I'd better check it is still there!!!